Tires

 We're not geeky about tires, and tend to like ones that don't flat and aren't too skinny. If it were up to me/Grant, we'd have a much smaller selection than we have, but two things: (1) At any given time our suppliers may be out of a favorite, so we need an equivalent backup; and (2) the millennials here tend to experiment with lots of different tires, and have opinions worth acting on. Nobody here is a fan of skinny tires or featherweight, flat-prone ones.